CMake Error: Could not find CMAKE_ROOT !!! cmake安装会，不能运行，出现错误。通常出现的原因是，cmake 命令本来存在，然后进行了安装。 类似于缓存导致失败的一样。
"CMake Error: Could not find CMAKE_ROOT !!!" 的解决方法(hash -r )
CMake Error: Could not find CMAKE_ROOT !!!
CMake has most likely not been installed correctly.
Modules directory not found in
hash -r 的帮助文档
hash [-lr] [-p filename] [-dt] [name] Each time hash is invoked, the full pathname of the command name is determined by searching the directories in $PATH and remembered. Any previously-remembered pathname is discarded. If the -p option is supplied, no path search is performed, and filename is used as the full file name of the command. The -r option causes the shell to forget all remembered locations. The -d option causes the shell to forget the remembered location of each name. If the -t option is supplied, the full pathname to which each name corresponds is printed. If multiple name arguments are supplied with -t, the name is printed before the hashed full pathname. The -l option causes output to be dis‐ played in a format that may be reused as input. If no arguments are given, or if only -l is supplied, information about remembered commands is printed. The return status is true unless a name is not found or an invalid option is supplied.